EP0235456B1 - Appareil et méthode de traitement d'image utilisant des blocs de données comprimées - Google Patents
Appareil et méthode de traitement d'image utilisant des blocs de données comprimées Download PDFInfo
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- EP0235456B1 EP0235456B1 EP86309702A EP86309702A EP0235456B1 EP 0235456 B1 EP0235456 B1 EP 0235456B1 EP 86309702 A EP86309702 A EP 86309702A EP 86309702 A EP86309702 A EP 86309702A EP 0235456 B1 EP0235456 B1 EP 0235456B1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T1/00—General purpose image data processing
- G06T1/20—Processor architectures; Processor configuration, e.g. pipelining
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T11/00—2D [Two Dimensional] image generation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T9/00—Image coding
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T9/00—Image coding
- G06T9/001—Model-based coding, e.g. wire frame
Definitions
- the present invention relates to an image processing apparatus and a method of image processing, in which compressed image data is stored in a memory device which represents image blocks, each block being obtained by dividing an image frame into a plurality of blocks.
- Image processing devices are known which are very expensive, being large in size and requiring a significant amount of time to perform a processing operation. Consequently, such machines have only been used as part of sophisticated printing systems.
- Examples of such systems are the Response 300 series manufactured by Scitex and the Studio-800 series manufactured by Crossfield.
- an image editing apparatus requires two editing functions. Firstly, high speed processing, performed by hardware circuits and, secondly, software processing performed by a central processing unit.
- the first of said functions is achieved by hardware, commonly referred to as a pipeline processor, which is applied to certain items of image processing which require high speed.
- the second function essentially software, is applied to certain items conducted in an interactive manner with an operator, requiring much greater processing times.
- the pipeline processor is principally applied to successive image processing, such as affine conversion (enlargement, reduction, displacement or rotation) for determining the image layout, spatial filtration (enhancement or smoothing) and colour conversions, with look-up tables.
- image processing such as affine conversion (enlargement, reduction, displacement or rotation) for determining the image layout, spatial filtration (enhancement or smoothing) and colour conversions, with look-up tables.
- CPU processing is generally applied to complex processes or those which cannot be easily implemented in hardware. Specifically, these include the extraction of an image in an arbitrary shape, the copying of an extracted image to another location and the partial correction of images. These processes generally require creativity on the part of the operator and longer periods of processing time can be tolerated. The processing functions of this type tend to be highly advanced.
- the system architecture of the image editing apparatus should be designed in order to achieve maximum performance of the two above mentioned editing functions. In order to achieve these functions with sufficiently high speed, it is necessary to consider the structure of the system, the data format to be handled, the flow of signals and the construction of functions etc.
- an image editing process with a high resolving power and a high tonal rendition requires a very large memory capacity.
- a data capacity in the region of 48 megabytes is required for the three colours of red, green and blue.
- vector quantization is considered to provide optimum operation.
- a longer processing time will be required if the processing is conducted in two steps, that is, a transfer step of the data from a file, such as from a rigid disk to a memory device and a process step of a hardware process being performed on the memory.
- a transfer step of the data from a file such as from a rigid disk to a memory device
- a process step of a hardware process being performed on the memory is a longer processing time.
- high speed processing is achievable if the processing is conducted simultaneously with the transfer of data being performed.
- the present invention provides an image processing apparatus for performing an affine transformation of image data representing an array of pixels defining a colour image, the image data comprising a plurality of colour signal components (Y,I,Q) each comprising respective colour signal data in respect of each of the pixels and the colour signal components collectively defining the intensity and colour of the array of pixels, wherein the apparatus comprises memory means for storing the colour image data as a plurality of arrays of data blocks such that a respective array of data blocks is provided for each of said colour signal components and each data block represents colour signal data for a corresponding block of pixels, wherein the location of each data block in its respective array of data blocks depends upon the position of the corresponding block of pixels in the array of pixels, and wherein each data block is stored in said memory means in a compressed form in accordance with a predetermined image encoding format which, with regard to at least one array of data blocks, compresses the colour signal data for each data block while substantially preserving the resolution of the colour signal data which it contains; and processing means for performing the affine transformation
- each data block of said at least one array of data blocks comprises an average value of the corresponding colour signal data for the corresponding block of pixels and, for each pixel in the corresponding block of pixels, a quantised code indicative of the colour signal data of that pixel relative to said average value
- the second process may modify the quantised codes within the compressed data block.
- each data block of said at least one array of data blocks may further comprise a standard deviation of the corresponding colour signal data for the corresponding block of pixels and the above mentioned quantised codes can be normalised in units of the standard deviation.
- each of the data blocks of said at least one array of data blocks comprises an average value of the corresponding signal data for the corresponding block of pixels and an angle of rotation of a pattern representing the corresponding block of pixels.
- the second process may operate by modifying the angle of rotation within the compressed data block.
- the image data may comprise separate luminance and chrominance signals, as desired, and the affine transformation may comprise for example rotation of the image.
- the invention further provides methods of image processing corresponding to the above.
- Fig. 1 illustrates an image processing apparatus wherein shown are a reader 1 for reading an original image with a high resolving power and with multiple density levels (a digital value of 2 bits or more); a compressor 2 for encoding image data; a memory 3 of a large capacity for temporarily storing the encoded image data or the data after a processing a before another processing; a pipeline processor 4 for editing input image data in raster form obtained from the memory 3; a random access image memory 5 for storing the results of processing; a decoder 6 for decoding the encoded data into another data of a high resolving power and of multiple density levels; a CPU 8 for controlling the entire apparatus and applying fine processing to the image data; a CRT interface 9 for supplying a cathode ray tube 10 with encoded data; a colour cathode ray tube 10; a converter 11 for converting the signal from reader 1 into a standard colour signal; and a converter 12 for converting the standard colour signal into a signal for a printer.
- the memory 3 need not be an expensive random access memory but can be, for example, a rigid disk memory.
- image data obtained by the reader 1 and composed for example of 8 bits per pixel for each of red, green and blue signals, are converted by a converter 11 to obtain a luminance signal Y and colour difference signals I, Q employed in the NTSC system.
- Such conversion can be achieved by a following matrix calculation of the red, green and blue data in the following manner: wherein the coefficients may be suitably adjusted according to the colour separating characteristics and gamma characteristics of the reader.
- Said signals Y, I, Q are compressed by a compressor 2 and stored in a disk memory 3 constituting an image data file.
- the image data in said disk are then read to an IC memory, constituting an image memory 5, for processing or editing.
- basic processes are executed, by a pipeline processor 4, formed as a hardware, through a raster operation, in the transfer form the disk to the image memory 5.
- the image data on the image memory 5 are processed and edited by a CPU 8.
- the procedure of image editing is displayed on a colour CRT 10 by a CRT controller 9 for monitoring.
- the edited result is converted into image data by a decoder 6, and then converted by a converter 12 into colour signals of yellow, magenta, cyan and black for supply to a colour printer 7.
- the luminance signal Y requires a compression which satisfactorily preserves the data on resolving power.
- a first conceivable method is block encoding.
- the average x and standard deviation o are calculated on the pixel data x in the m x m block.
- the density of each pixel is represented by several bits, for example by requantising (x - x ) / ⁇ .
- Fig. 2A shows the format of thus compressed data, in which the average value and the standard deviation are followed by the density information in order to positions of pixels in the block. Consequently a rotation of the pixels in the block can be achieved by changing the sequence of the density information.
- a second conceivable method is vector quantization of m x m pixels.
- the pixel data in the m x m block are represented by the average value x , standard deviation ⁇ , a code indicating image rotation and a code representing image pattern, in order to achieve data compression.
- Fig. 2B shows the corresponding data format, wherein the rotation code indicates the angle of rotation of the image pattern in the m x m block, and, in the present embodiment, indicates an angle of 0°, 90°, 180° or 270° in two bits.
- the pixels in the block can be rotated by a change in the rotation code.
- the affine conversion is conducted by entering raster source data from the file, reader or image memory, and storing said data in random access in a destination memory, for which the image memory is utlised.
- the affine conversion can be achieved at a very high speed, by means of the pipeline converter 4, in the course of data transfer from the file to the image memory, in successive manner.
- the image data are in the aforementioned compressed form, and the address is defined in an address space corresponding to the compressed data.
- Fig. 3A shows data of 4 blocks A, B, C, D constituting an original image. If addresses are generated and stored in the destination memory by the above-explained rotation process for a block rotation of 90°, 180° or 270°, the resulting image does not faithfully reproduce the original image, as shown in Figs. 3B, 3C or 3D. Consequently the pixels in each block are rotated according to the angle of rotation to achieve faithful reproduction as shown in Fig. 3E, 3F or 3G, respectively representing a rotation of the pixels of each block by 90°, 180° or 270°. Said rotation can be achieved by varying the rotation code of 2 bits shown in Fig. 2B, without modifying the pattern codes.
- the rotation in block is selected respectively in four ranges of image rotation of 90° each.
- the angle of image rotation is divided into four ranges of 315° - 45°, 45° - 135°, 135° - 225° and 225° - 315°, and a rotation in the block of 0°, 90°, 180° or 270°, is respectively selected.
- Figs. 5A to 5D show examples in the block encoding format shown in Fig 3A, of reformatting by rearrangement by rotation in the block, respectively corresponding to a rotation of 0°, 90°, 180° or 270°.
- the data x and ⁇ are not changed, and the succeeding density data are permutated.
- the original data sequence ABCD shown in Fig. 5A, corresponding to a rotation of 0°, is changed to BDAC as shown in Fig. 5B corresponding to a rotation of 90°, or DCBA as shown in Fig. 5C for 180°, or CABD as shown in Fig. 5D for 270°.
- Fig.6 shows an embodiment of a circuit for converting the data format in the block, wherein the input signals x , ⁇ are stored in a buffer 80, and the succeeding density data are separately stored in buffers 81, 82, 83, 84.
- Selectors 85, 86, 87, 88 receive select signals corresponding to the angle of rotation, from an unrepresented controller. For example there is employed a select signal of 2 bits, in which 0, 1, 2 and 3 respectively corresponding to an angle of 0°, 90°, 180° or 270°.
- Output lines A, B, C, D of said buffers 81, 82, 83, 84 are connected to input lines X, Y, Z, W of the selectors 85, 86, 87, 88 in different permutations.
- each selector releases a signal received at the input terminal Y, whereby signals B, D, A and C are respectively obtained form the selectors 85, 86, 87 and 88.
- These output signals are combined with x and o in a buffer 90 to obtain an output data format as shown in Fig. 5.
- the affine conversion is achieved by a combination of a collective rotation of compressed data of an m x m block, and a rotation of compressed data in said m x m block.
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- Multimedia (AREA)
- Image Processing (AREA)
- Storing Facsimile Image Data (AREA)
- Editing Of Facsimile Originals (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
Claims (20)
- Appareil de traitement d'images destiné à réaliser une transformation affine de données d'images représentant un groupement de pixels définissant une image en couleurs, les données d'images comprenant une pluralité de composantes de signaux de couleurs (Y, I, Q) comprenant chacun des données de signal de couleur respectives par rapport à chacun des pixels et les composantes de signaux de couleurs définissant ensemble l'intensité et la couleur du groupement de pixels, l'appareil comportant :des moyens à mémoire (3, 5) destinés à stocker les données d'images en couleur sous la forme d'une pluralité de groupements de blocs de données tels qu'un groupement respectif de blocs de données est prévu pour chacune desdites composantes de signal de couleur et chaque bloc de données représente une donnée de signal de couleur pour un bloc correspondant de pixels, dans lequel l'emplacement de chaque bloc de données dans son groupement respectif de blocs de données dépend de la position du bloc correspondant de pixels dans le groupement de pixels, et dans lequel chaque bloc de données est stocké dans lesdits moyens à mémoire sous une forme compressée conformément à un format de codage d'image prédéterminé qui, en ce qui concerne au moins un groupement de blocs de données, compresse les données de signaux de couleur pour chaque bloc de données tout en préservant sensiblement la résolution des données de signaux de couleur qu'il contient ; etdes moyens de traitement (4) destinés à effectuer la transformation affine des données d'images par :(i) un premier processus dans lequel les blocs de données stockés dans lesdits moyens à mémoire sont décalés dans les groupements respectifs de blocs de données afin de modifier les positions du bloc correspondant de pixels dans l'image en couleurs en conformité avec ladite transformation affine ; et(ii) un second processus dans lequel les données de signaux de couleur à l'intérieur de chaque bloc de données dudit, au moins un, groupement de blocs de données sont modifiées tandis que les blocs de données restent sous ladite forme compressée afin de modifier les positions de pixels à l'intérieur des blocs correspondants de pixels en conformité avec ladite transformation affine.
- Appareil selon la revendication 1, dans lequel les composantes de signaux de couleurs comprennent une composante de luminance et des première et seconde composantes de chrominance, et dans lequel ledit, au moins un, groupement de blocs de données est constitué par des données de signaux de couleur de la composante de luminance.
- Appareil selon la revendication 2, dans lequel chacun des blocs de données représentant lesdites première et seconde composantes de chrominance comprend une valeur moyenne de la donnée de signal de couleur correspondante pour le bloc correspondant de pixels.
- Appareil selon la revendication 2 ou 3, dans lequel chacun des blocs de données représentant ladite composante de luminance représente un bloc de m0 x m0 pixels et chacun des blocs de données représentant lesdites première et seconde composantes de chrominance représente un bloc de m1 x m1 pixels et où m1 est supérieur à m0.
- Appareil selon l'une quelconque des revendications précédentes, dans lequel chaque bloc de données dudit, au moins un, groupement de blocs de données comprend une valeur moyenne des données de signaux de couleur correspondantes pour le bloc correspondant de pixels et, pour chaque pixel dans le bloc correspondant de pixels, un code quantifié représentatif de la donnée de signal de couleur de ce pixel par rapport à ladite valeur moyenne, et dans lequel le second processus modifie lesdits codes à l'intérieur du bloc de données compressé.
- Appareil selon la revendication 5, dans lequel chaque bloc de données dudit, au moins un, groupement de blocs de données comprend en outre un écart type de la donnée correspondante de signal de couleur pour le bloc correspondant de pixels, et dans lequel lesdits codes quantifiés représentatifs des données de signaux de couleur par rapport à ladite valeur moyenne sont normalisés en unités dudit écart type.
- Appareil selon l'une quelconque des revendications 1 à 4, dans lequel chacun des blocs de données dudit, au moins un, groupement de blocs de données comprend une valeur moyenne de la donnée de signal correspondante pour le bloc correspondant de pixels et un angle de rotation d'un motif représentant le bloc correspondant de pixels, et dans lequel le second processus agit en modifiant ledit angle de rotation.
- Appareil selon l'une quelconque des revendications précédentes, comportant en outre un moyen d'affichage (10) destiné à afficher une image en conformité avec les données d'image traitées stockées dans lesdits moyens à mémoire.
- Appareil selon l'une quelconque des revendications précédentes, dans lequel ladite transformation affine comprend une rotation de l'image.
- Appareil selon la revendication 9, comportant des moyens de sélection (85, 86, 87, 88) destinés à sélectionner de façon variable des degrés de rotation en fonction du signal de sélection, et dans lequel lesdits moyens de traitement (4) peuvent agir de façon à effectuer lesdits premier et second processus en conformité avec le degré sélectionné de rotation.
- Procédé pour effectuer une transformation affine de données d'image représentant un groupement de pixels définissant une image en couleurs, les données d'image comprenant une pluralité de composantes de signaux de couleurs (Y, I, Q) comprenant chacune une donnée de signal de couleur respective vis-à-vis de chacun des pixels et les composantes de signaux de couleurs définissant ensemble l'intensité et la couleur du groupement de pixels, le procédé comprenant les étapes dans lesquelles :on stocke les données d'images en couleurs sous forme de plusieurs groupements de blocs de données de manière qu'un groupement respectif de blocs de données soit prévu pour chacune desdites composantes de signaux de couleurs et que chaque bloc de données représente des données de signaux de couleur pour un bloc correspondant de pixels, dans lequel l'emplacement de chaque bloc de données dans son groupement respectif des blocs de données dépend de la position du bloc correspondant de pixels dans le groupement de pixels et dans lequel chaque bloc de données est stocké sous une forme compressée conformément à un format prédéterminé de codage d'image qui, vis-à-vis d'au moins un groupement de blocs de données, compresse les données de signaux de couleur pour chaque bloc de données tout en préservant sensiblement la résolution des données de signaux de couleur qu'il contient eton exécute la transformation affine des données d'image en :(i) décalant les blocs de données stockés dans les groupements respectifs de blocs de données afin de modifier les positions du bloc correspondant de pixels dans l'image en couleur conformément à ladite transformation affine, et(ii) modifiant les données de signaux de couleur dans chaque bloc de données dudit, au moins un, groupement de blocs de données tandis que les blocs de données restent dans ladite forme compressée afin de modifier les positions de pixels à l'intérieur des blocs correspondants de pixels conformément à ladite transformation affine.
- Procédé selon la revendication 11, dans lequel les composantes de signaux de couleur comprennent une composante de luminance et des première et seconde composantes de chrominance, et dans lequel ledit, au moins un, groupement de blocs de données est constitué par des données de signaux de couleur de la composante de luminance.
- Procédé selon la revendication 12, dans lequel chacun des blocs de données représentant lesdites première et seconde composantes de chrominance comprend une valeur moyenne des données correspondantes de signaux de couleur pour le bloc correspondant de pixels.
- Procédé selon la revendication 12 ou 13, dans lequel chacun des blocs de données représentant ladite composante de luminance représente un bloc de m0 x m0 pixels et chacun des blocs de données représentant lesdites première et seconde composantes de chrominance représente un bloc de m1 x m1 pixels, et où m1 est supérieur à m0.
- Procédé selon l'une quelconque des revendications 11 à 14, dans lequel chaque bloc de données dudit, au moins un, groupement de blocs de données comprend une valeur moyenne des données correspondantes de signaux de couleur pour le bloc correspondant de pixels et, pour chaque pixel dans le bloc correspondant de pixels, un code quantifié représentatif des données de signaux de couleur de ce pixel par rapport à ladite valeur moyenne, et dans lequel ladite étape de modification modifie lesdits codes à l'intérieur du bloc de données compressé.
- Procédé selon la revendication 15, dans lequel chaque bloc de données dudit, au moins un, groupement de blocs de données comprend en outre un écart type des données correspondantes de signaux de couleur pour le bloc correspondant de pixels, et dans lequel lesdits codes quantifiés représentatifs des données de signaux de couleur par rapport à ladite valeur moyenne sont normalisés en unités dudit écart type.
- Procédé selon l'une quelconque des revendications 11 à 14, dans lequel chacun des blocs de données dudit, au moins un, groupement de blocs de données comprend une valeur moyenne des données de signaux correspondantes pour le bloc correspondant de pixels et un angle de rotation d'un motif représentant le bloc correspondant de pixels, et dans lequel ladite étape de modification modifie ledit angle de rotation.
- Procédé selon l'une quelconque des revendications 11 à 17, comprenant en outre une étape d'affichage d'une image en conformité avec les données d'images traitées.
- Procédé selon l'une quelconque des revendications 11 à 18, dans lequel ladite transformation affine comprend une rotation de l'image.
- Procédé selon la revendication 19, comprenant l'étape consistant à sélectionner de façon variable les degrés de rotation en fonction d'un signal de sélection, et dans lequel ladite étape d'exécution exécute lesdites étapes de décalage et de modification en fonction du degré sélectionné de rotation.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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EP93203482A EP0597556B1 (fr) | 1985-12-13 | 1986-12-12 | Appareil de traitement d'images |
EP93203481A EP0597555B1 (fr) | 1985-12-13 | 1986-12-12 | Appareil de traitement d'images |
Applications Claiming Priority (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP281631/85 | 1985-12-13 | ||
JP281633/85 | 1985-12-13 | ||
JP60281633A JPS62140178A (ja) | 1985-12-13 | 1985-12-13 | 画像編集処理装置 |
JP28163185A JPH0679322B2 (ja) | 1985-12-13 | 1985-12-13 | 画像編集処理装置 |
JP281634/85 | 1985-12-13 | ||
JP60281634A JP2653781B2 (ja) | 1985-12-13 | 1985-12-13 | 画像編集処理方法 |
JP281632/85 | 1985-12-13 | ||
JP60281632A JP2575641B2 (ja) | 1985-12-13 | 1985-12-13 | 画像編集処理方法 |
JP60281537A JPS62140549A (ja) | 1985-12-14 | 1985-12-14 | 画像編集処理装置 |
JP281537/85 | 1985-12-14 |
Related Child Applications (4)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93203481A Division EP0597555B1 (fr) | 1985-12-13 | 1986-12-12 | Appareil de traitement d'images |
EP93203482A Division EP0597556B1 (fr) | 1985-12-13 | 1986-12-12 | Appareil de traitement d'images |
EP93203481.2 Division-Into | 1986-12-12 | ||
EP93203482.0 Division-Into | 1986-12-12 |
Publications (3)
Publication Number | Publication Date |
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EP0235456A2 EP0235456A2 (fr) | 1987-09-09 |
EP0235456A3 EP0235456A3 (fr) | 1989-05-24 |
EP0235456B1 true EP0235456B1 (fr) | 1999-03-24 |
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Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
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EP86309702A Expired - Lifetime EP0235456B1 (fr) | 1985-12-13 | 1986-12-12 | Appareil et méthode de traitement d'image utilisant des blocs de données comprimées |
EP93203481A Expired - Lifetime EP0597555B1 (fr) | 1985-12-13 | 1986-12-12 | Appareil de traitement d'images |
EP93203482A Expired - Lifetime EP0597556B1 (fr) | 1985-12-13 | 1986-12-12 | Appareil de traitement d'images |
Family Applications After (2)
Application Number | Title | Priority Date | Filing Date |
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EP93203481A Expired - Lifetime EP0597555B1 (fr) | 1985-12-13 | 1986-12-12 | Appareil de traitement d'images |
EP93203482A Expired - Lifetime EP0597556B1 (fr) | 1985-12-13 | 1986-12-12 | Appareil de traitement d'images |
Country Status (3)
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US (3) | US5861892A (fr) |
EP (3) | EP0235456B1 (fr) |
DE (3) | DE3650764T2 (fr) |
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Also Published As
Publication number | Publication date |
---|---|
DE3650764D1 (de) | 2001-11-22 |
EP0597556B1 (fr) | 2001-10-17 |
EP0597555A1 (fr) | 1994-05-18 |
EP0235456A2 (fr) | 1987-09-09 |
US5812146A (en) | 1998-09-22 |
EP0235456A3 (fr) | 1989-05-24 |
DE3650764T2 (de) | 2002-07-11 |
US5485557A (en) | 1996-01-16 |
DE3650771D1 (de) | 2002-08-14 |
US5861892A (en) | 1999-01-19 |
DE3650717D1 (de) | 1999-04-29 |
DE3650717T2 (de) | 1999-09-16 |
EP0597556A1 (fr) | 1994-05-18 |
EP0597555B1 (fr) | 2002-07-10 |
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